The group formed in 1977 after Watson, one of the founders of Greenpeace, became frustrated with the seminal environmental group’s hesitation to engage in direct action. Since then the group has faced down whalers year-after-year by literally chasing their ships around the open seas.

Unlike most direct action activism, Watson insists that Sea Shepherd’s anti-whaling campaigns are entirely legal. He cites international treaties under the International Whaling Commission that state that any human has the right to interfere with illegal poaching or whaling. While the laws exist, Watson says that Sea Shepherd are the only ones enforcing them. He has been arrested numerous times across the globe but has never been convicted of any wrongdoing.